My expedition stopped accelerating all the sudden, didnt shut down though, it continued to idle, the electronic throttle contol light came on. so i turned it off for a few then started it and it was fine, just wondering what is going on because we are traveling tomorrow and dont want any issues or an accident

Your engine has an electronic throttle body. They don't use an idle air control valve. They control idle by cracking open the throttle plate electronically. If you have idle problems, chances are you've got carbon buildup around the throttle plate. Here's how to clean it. http://ricksfreeautorepairadvice.com/clean-an-electronic-throttle-body

Problem with the electronic throttle control .
It should be noted that the ETC system includes a wrench light on the instrument cluster that illuminates when a fault is detected. Faults are also accompanied by DTCS and the "Check Engine Soon" light. Your best bet is to take your vehicle to a reputable ASE certified repair shop .
Overview The Generation II (Gen II) Torque Based Electronic Throttle Control (ETC) is a hardware and software strategy that delivers a transmission output shaft torque (via throttle angle) based on driver demand (pedal position). It utilizes an electronic throttle body, the PCM and a accelerator pedal assembly to control throttle opening and engine torque. The ETC system basically replaces the standard cable operated accelerator pedal, idle air control (IAC) motor, 3-wire throttle position sensor (TPS) and mechanical throttle body .

This has nothing to do with the Catalytic converter ! Plugged catalytic converters don't go away after shutting off the vehicle !
This reduced engine power has to do with the
Throttle Actuator Control (TAC) System
Reduced Engine Power Mode When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
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Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.

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Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.

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Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.

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Forced idle mode--The ECM will perform the following actions:

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Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.

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Ignore the accelerator pedal input.

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Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.

1st your car should not idle below 110 rpm even in gear

idle problems on these are caused by both broken or open vac ports or a dirty throttle body the A/F ratio cant get a correct reading

Yes , maybe next time you may not be so lucky ! The Gas pedal an throttle body have two position sensors ,probably getting worn .It mite be to your benefit to have it checked .

Your Electric Power Control light is trying to tell you that your electronic throttle control is not working, hence the accelerator pedal signal is not getting to the throttle body. If you have wiring diagrams and tools to troubleshoot this, you may find what's wrong (components, wiring, PCM, etc). If not, you should have it analyzed and corrected by a qualified repair shop.

The check engine light being on now is a different problem , Have DTC'S - diagnostic trouble codes checked ,will have something to do with electronic throttle control . That is what reduced engine power is about . It's in a reduced power mode.
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.

Do you know what electronic throttle control is ?
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Throttle Actuator Control (TAC) System Description

The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The engine control module (ECM)

Your best bet , take it to a qualified repair shop .

crunk it up ,that's good english . Cranked it up How many miles on the vehicle ! The wrench light is a warning light for the transmission or the electronic throttle control .All new vehicle's have electronic throttle control , there are position sensor's in the APP an in the throttle body an they ware out . It's your responsibility to keep it maintained . Not just to jiffy lube !To the Dealer to have diagnostic's run on the electronics. Accelerator Pedal Position Sensor vs. Throttle Position Sensor

Inside Car Accelerator Pedal Position Sensor vs Throttle Position Sensor

Set your idle speed to mfg recomindation if that doesnt help check the dash pot that is what keeps the engine from stalling at sudden speed reduction

We ended up taking the vehicle to a trusted auto repair shop. The codes came up indicating a failed throttle body, most likely in the electronics. After a few more pinpoint tests, the recommendation was to replace the throttle body. The cost for this repair was just under $500. Since there is no aftermarket on this part, Genuine Ford parts were used.